Hi everyone,
I know a lot of you have been asking to see results from the data you have been collecting. Kristina, myself, and a few others are working on a paper right now where we are trying to look at the data collected so far as a whole and show a few of the neat things the Grape can do.
Here is a figure I just worked up that shows the response on 10 MHz to both an X1 and a C4.9 class solar flare from October 28, 2021. The top panel shows the NOAA GOES X-ray flux data that is used to identify the onset of the flare in space, the second panel is the Doppler shift, and the third panel is the Grape Received power. Grapes are color-coded by longitude, with darker colors being more west and brighter colors being more east.
The X1 flare generates a very strong response in the Doppler shift. It is interesting that you do not see the Doppler response at the peak of the Solar Flare, but rather as the flare is ramping up. You can also see that the most Eastward stations have the strongest response… they are the stations closest to local noon and receiving the brunt of the solar flare impact. All stations (except W3LLA), see a decrease in received power due to the absorption caused by the flare.
While the X1-class flare is cool, I think it is really neat that these Grapes can sense much weaker solar flares as well. Take a look at the response of the Doppler shift due to the C4.9 class flare that occurs as 1738 UT. It is impressive we can measure that effect!
You can see there is one station that has almost 0-Hz Doppler shift and very little change in received power throughout the whole plot. That is Maxwell Moran W3LLA, who is in Fort Collins, CO practically line-of-sight of WWV. Therefore, his station serves as a control and does not see the larger ionospheric variations.
As we write this paper, we are posting all data that has been submitted to a public Zenodo repository and creating a set of python-based analysis tools to create these plots. Once I get things more stable with them, I’ll give a demo at one of the Thursday telecons so others can use the tools as well.
73 Nathaniel W2NAF
-----------------------------------------------
Dr. Nathaniel A. Frissell, Ph.D., W2NAF
HamSCI Lead / Assistant Professor
Department of Physics and Electrical Engineering
University of Scranton
(973) 787-4506
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Hi Jonathan,
Yes, the code that produced that plot is available here:
The code for downloading the data should also be in there. We can talk about it on the telecon tonight if you like.
73 Nathaniel W2NAF
The code and instructions can be found at https://github.com/HamSCI/hamsci_psws
I'm having some FreeBSD Python dependency issues. For anyone who has the code running, can you pull the Grape and GOES data for January 15th, 2023, from 13:00UT to 16:00UT for the Grape stations listed in the plot and run the plotting code for that duration? Here are the NAA and NAu plots for reference:
Thanks!
Jonathan
KC3EEY
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Hi Jonathan,
I can probably run that code for you over the next week or so. Let’s chat about it tonight.
Nathaniel
From: hamsci...@googlegroups.com <hamsci...@googlegroups.com>
On Behalf Of Jonathan
Sent: Monday, January 23, 2023 11:24 AM
Cc: hamsci...@googlegroups.com
Subject: Re: [hamsci-grape] Grape Flares
Graham,
The code and instructions can be found at https://github.com/HamSCI/hamsci_psws
I'm having some FreeBSD Python dependency issues. For anyone who has the code running, can you pull the Grape and GOES data for January 15th, 2023, from 13:00UT to 16:00UT for the Grape stations listed in the plot and run the plotting code for that duration? Here are the NAA and NAu plots for reference:
Thanks!
Jonathan
KC3EEY
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